In natural climates, solar radiation is considered to be the main cause of coating aging, and the principle of exposed radiation under window glass is the same. Therefore, for artificial weather aging and artificial exposure radiation, it is essential to simulate solar radiation. The xenon arc radiation source changes the spectral distribution of the radiation produced by one of two different light filtering systems, simulating the spectral distribution of ultraviolet and visible light of solar radiation, and the ultraviolet and visible light of solar radiation after filtering through a 3mm thick window glass Spectral distribution (Method 2).
The energy distribution of the two spectra describes the irradiance value and allowable deviation of the optical radiation filtered by the filter in the ultraviolet range below 400mm wavelength. In addition, CIE No. 85 has an irradiance standard for wavelengths up to 800 nm, because only within this range, xenon arc radiation can better simulate solar radiation.
During the exposure test of the exposure equipment, the irradiance may change due to the aging of the xenon arc and the filter system. This change occurs in particular in the ultraviolet range, which has the greatest influence on the photochemistry of polymer materials. Therefore, not only the exposure time must be measured, but also the wavelength range below 400 nm or the exposure radiation energy at a specified wavelength such as 340 nm should be measured, and these values ​​should be used as reference values ​​for coating aging.
It is impossible to accurately simulate the effects of various aspects of climatic conditions on the coating. Therefore, the term of artificial weather aging is used in the standard of xenon lamp test chamber to distinguish natural weather aging. The solar radiation test of the simulated window glass mentioned in the standard of the xenon lamp test chamber is called artificial radiation exposure.
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